Not sure how much you're looking to spend, but a Ranger OD in front of an SM 420 would handle anything you could throw at it and give you a lot of gear options.

http://www.advanceadapters.com/prod...overdrive-27-with-a-5125-retainer-index/


1945 1.5-Ton Chevy Big Bolt
Maynard
In the Stovebolt Gallery
More pix of the old truck